论文部分内容阅读
采用三点弯曲方法测试了压力梯度化学气相浸渗法(CVI)工艺制备的2D炭 炭复合材料的性能,借助于扫描电镜研究了断口和界面形貌,分析了密度和纤维基体界面对材料力学性能的影响。结果表明,随试样密度增加,2D炭 炭复合材料的断裂模式从剪切断裂、层间分离向拉伸断裂转变。材料密度对弯曲强度和模量影响很大,但对弯曲挠度基本没有影响。揭示了影响2D炭 炭复合材料弯曲挠度的关键因素是纤维与热解炭基体界面的结合情况。
The three-point bending method was used to test the properties of 2D carbon-carbon composites prepared by pressure gradient chemical vapor infiltration (CVI). The fracture surface and interfacial morphology were studied by scanning electron microscopy. The effect of density and fiber matrix interface on mechanical properties The impact of performance. The results show that with the increase of sample density, the fracture mode of 2D carbon-carbon composites changes from shear fracture and interlayer separation to tensile fracture. Material density has a great influence on flexural strength and modulus, but has virtually no effect on flexural deflection. It is revealed that the key factor that affects the bending deflection of 2D carbon composites is the combination of fiber and pyrolytic carbon substrate interface.